完成基于管道过滤器风格的KWIC实现

1、实验2：软件体系结构风格实现一、实验目的1）初步了解不同的体系结构风格2）掌握不同体系结构风格的实现二、实验学时 4学时。三、实验方法根据KWIC的描述，用所熟悉的语言，完成实验内容。四、实验环境Windows7旗舰版 jdk1.6 Eclipse3.7.0五、实验内容2）完成基于管道过滤器风格的KWIC实现六、实验操作步骤1. KWIC描述：KWIC索引系统接受一些行，每行有若干字，每个字由若干字符组成；每行都可以循环移位。重复地把第一个字删除，然后接到行末； KWIC把所有行的各种移位情况按照字母表顺序输出。完成基于管道过滤器风格的KWIC实现Main类package kwic_pipe;

2、import java.io.File;import java.util.Scanner;public class Main public static void main(String args) File infile = new File(e:mykwic_in.txt); File outfile = new File(e:mykwic_out.txt); Scanner inputfile; Scanner outputfile; try inputfile = new Scanner(infile); outputfile = new Scanner(outfile); / 定义三

3、个管道 Pipe pipe1 = new Pipe(); Pipe pipe2 = new Pipe(); Pipe pipe3 = new Pipe(); / 定义四种过滤器 Input input = new Input(infile, pipe1); Shift shift = new Shift(pipe1, pipe2); Output output = new Output(pipe3, outfile); / 启动四种过滤器的线程 input.transform() shift. transform (); output. transform (); / 直接输出结果 Syste

4、m.out.println(- infile -); String str = null; while (inputfile.hasNextLine() str = inputfile.nextLine(); System.out.println(str); System.out.println(input end); Thread.sleep(3000); System.out.println(- outfile -); while (outputfile.hasNextLine() System.out.println(str); inputfile.close(); outputfile

5、.close(); catch (Exception e) e.getMessage(); Filter类package kwic_pipe;import java.io.IOException;public abstract class Filter /定义输入管道 protected Pipe input; /定义输出管道 protected Pipe output; private boolean isStart = false; Filter(Pipe input, Pipe output) this.input = input; this.output = output; / 防止多

6、次调用，调用之后线程开始执行 public void start() if(!isStart) isStart = true; Thread thread = new Thread(); thread.start(); /线程的 run 方法 public void run() try this.transform(); catch (IOException e) e.getMessage(); /将输入数据转换为所需数据并写入输出管道 /由子类实现抽象方法 protected abstract void transform()throws IOException;Pipe类package k

7、wic_pipe;import java.io.IOException;import java.io.PipedReader;import java.io.PipedWriter;import java.io.PrintWriter;import java.util.Scanner;public class Pipe /输入管道 private Scanner pipereader; /输出管道 private PrintWriter pipewriter; public Pipe()PipedWriter pw = new PipedWriter();PipedReader pr = new

8、 PipedReader();trypw.connect(pr); catch (IOException e)e.getMessage();pipewriter = new PrintWriter(pw);pipereader = new Scanner(pr); /读入一行数据到管道 /return 读入的数据 public String readerLine() throws IOException return pipereader.nextLine(); /从管道输出一行数据 public void writerLine(String strline) throws IOExcepti

9、on pipewriter.println(strline); /将读管道关闭，调用该方法后，不能再从管道中读数据 /如不能关闭则抛出异 public void closeReader() throws IOException pipereader.close(); /先刷新数据，在将写管道关闭，调用该方法后，不能向管道中写数据 /如不能关闭则抛出异常 public void closeWriter() throws IOException pipewriter.flush(); pipewriter.close(); Alphabetizer类 package kwic_pipe;impor

10、t java.io.IOException;import java.util.ArrayList;import java.util.Collections;public class Alphabetizer extends Filter private ArrayList al = new ArrayList(); Alphabetizer(Pipe input, Pipe output) super(input, output); /对读入的数据进行排序 protected void transform() throws IOException String templine = null;

11、 /读入数据 while(templine = input.readerLine() != null) al.add(templine); /按字母表排序 Collections.sort(al); /对排序后的数据进行输出 for(int i = 0; i al.size(); i+) output.writerLine(al.get(i); input.closeReader(); output.closeWriter(); Shift类package kwic_pipe;import java.io.IOException;import java.util.ArrayList;publi

12、c class Shift extends Filter /单词的列表 private ArrayList wordlist = new ArrayList(); /重组后的行的列表 private ArrayList linelist = new ArrayList(); Shift(Pipe input, Pipe output) super(input, output); Override protected void transform() throws IOException String templine = ; /读数据 while(templine = input.reader

13、Line() != null) /将数据拆分为不同单词 this.lineSplitWord(templine); /将单词重组为句子 this.recombination(); /输出重组结果 for(int i = 0; i linelist.size(); i+) output.writerLine(linelist.get(i); /清空wordlist、linelist和templine wordlist.clear(); linelist.clear(); templine = ; input.closeReader(); output.closeWriter(); /从一行中提取

14、单词存入单词表中 private void lineSplitWord(String line) String word = ; int i = 0; while(i line.length() if(line.charAt(i) != ) word += line.charAt(i); else wordlist.add(word); i+; private void recombination() for(int j = 0; j wordlist.size(); j+) String templine = ; for (int k = wordlist.size() - 1 - j; k

15、 wordlist.size(); k+) templine += wordlist.get(k) + ; for (int m = 0; m wordlist.size() - 1 - j; m+) if(m != wordlist.size() - j - 2) templine += wordlist.get(m) + ; else templine += wordlist.get(m); linelist.add(templine); Input类package kwic_pipe;import java.io.File;import java.io.IOException;impor

16、t java.util.Scanner;public class Input extends Filter /输入文件的文件名 private File infile; Input(File file, Pipe output) super(null, output); this.infile = file; Override /读取数据 protected void transform() throws IOException Scanner sc = new Scanner(infile); String templine = ; while(templine = sc.nextLine() != null) output.writerLine(templine); output.closeWriter(); sc.close(); Output类package kwic_pipe;import java.io.File;import java.io.IOException;import java.io.PrintWriter;public class Output extends Filter /输出文件的文件名 private File file; Output(Pipe input, File file) super(input, null); t